Centrifugal pump



May 6, 1930. c. G. woon 1,757,281

CENTRIFUGAL PUMP Filed June 24. 1926 ATTOIENEYJ Patented May 6, 1930UNITED STATES PATENT OFFICE CLARENCE G. WOOD, OF MUNCIE, INDIANA,ASSIGNOR, BY MESNE ASSIGNMENTS, T AUTO PRIME PUMP COMPANY, OF CLEVELAND,OHIO, A CORPORATION OF OHIO CENTRIFUGAL PUMP Application filed June 24,

My invention relates to improvements in centrifugal pumps and has forone of its objects the production of a pump of this character having ahigher efficiency than has heretofore been obtained with centrifugalpumps.

Another object of my invention is to provide a pump which from amanufacturing standpoint may be constructed more readily and cheaplythan this type of pump has heretofore been built.

v v For the purpose of disclosing my invention I have illustrated oneembodiment thereof in the accompanying drawing in which Fig.1 is a sideelevation partly in section 15 of a pump embodying my invention;

Fig. 2 is a sectional view on the line 2-2 of Fig. 1; v

Fig. 3 is a detail section through the 1mpeller channel; a t

Fig. 4 is a similar section through the intake ports;

Fig. 5 is a similar section through the outlet port;

Fig. 6 is a perspective view showing one of 25 the channel rings;

Fig. 7 is a perspective view of the opposite ring, and r Fig. 8 is aside elevation of a portion of the impeller. i

In the embodimentillustrated I providea cylindrical casing 1 which ispreferably formed from a single casting, which casing has a pcripheralinlet 2 extending through a neck 3 which provides means for connectingthe inlet with the inlet pipe. A similar neck 4. having an outlet 5 isprovided on the casing. One side of the casing is open and this openside is adapted to he closed by a head or cover 6 secured to the casingby suitable cap screws 7. The casing is adapted to receive a pair ofrings 8 and 9 which mate together when assembled in the casing and forman annular impeller channel. To this end the ring 9 is provided with anannular flange 10 at its periphery. and with an inner annular flange 11,the two forming a channel 12 comprising a portion of the impellerchannel. The height of the flange 11 is less than that of the flange 10to the extent of the thickness of the im- 1926. Serial No. 118,150.

peller wheel so that the flange 1O over-hangs the flange 11. 1

At one point in the periphery of the ring in a position where it willcoincide with the opening 5 there is provided a channel or cutawayportion 13 in the flange 10 to provide for the discharge opening in theimpeller channel and adjacent this opening and in a position where itwill coincide with the intake opening 2 the flange 10 has extendingtherethrough and meeting with the channel 12, an inlet port 14. At thepoint where this port is formed the flange 10 is thickened as at 15 toreduce the size of the channel 12 so that at this point the distancebetweenthe inner face of the flange 11 and the inner face of the flange10 is about equal to the length of an impeller blade. The portion 15thus blocks direct radial connection between the inlet pasi sage 2 andthe impeller blades, forcing flow through the inlet to the impellerblades axially of the impeller. This isimportant because normal rotationof the impeller tends to throw the fluid radially ot' the impeller andif there is direct radial connection between the spares between theimpeller blades and the inlet. the impeller blades will be actingdirectly against inflow, thus creating eddy currents at the point ofinflow to the impeller blades, which would materially lessen eflicieney.

The ring 8 is adapted to mate with the ring 9 andis provided with anannular flange 10 to coincide with the flange 10 and a. flange 11 tocoincide with the flange 11, the two flanges 11 and 10 forming, betweenthem. an annular channel 12 which coincides with the channel 19 tocomplete the impeller channel. This ring like the ring 9 is providedwith an outlet channel 13 communicating with the channel or recess 13and with an inlet port 16 meeting the channel 12 In each of the ringsthere is provided in the channel 12 to separate the intake and deliveryports, aweb 17 or 17.

The impeller wheel preferably comprises a hub 18 having radial spokes 19carrying at their outer ends the rim 20. The impeller blades 21 aremounted on this rim,,being preferably cast integrally therewith and thediameter of the wheel is such that these blades lie wholly within theimpeller channel the blades however being slightly 'shorter than theheight of the channel except at the point where the flange 10 isthickened at 15 where the height of the channel is substantially thatstuffing box bearing 23 in the side of the casing and having its outerend mounted in an outboard bearing 24. When the parts are assembled therings are clamped between the head 6 of the casing and the side thereofand snugly fit the casing. These rings are held against relativemovement with respect to one another and with respect to the casingby apin 25 passing through the rings and into the casing.

By the above construction the fluid enters the impeller chamber at theperiphery thereof through the port 2 and the ports 1i and to beingdelivered however transversely of the impeller blades by which it'ispicked up and, traversing the impeller channel, is delivered through theports 13 and 13 which constitute the outlet port of the channel andthrough the outlet port 5 of the casing. During its traversing movementthrough the channel the liquid repeatedly comes in contact with theimpeller blades whereby the efficiency of the pump is increased and dueto the fact that the impeller blades are curved away from the directionof rotation a distinct radial impelling force, in addition to thecentrifugal action, is imparted to the fluid at the outlet port.

I claim as my invention:

1. In a centrifugal pump the combination with a casing, of a pair ofremovable rings mounted in said casing and formed to provide an annularimpeller channel, an impeller wheel operating in said casing. impellerblades at the periphery ofsaid wheel operating in said channel, saidchannel having peripheral intake ports arranged to deliver fluid intosaid channel and into contact with said blades, and means blockingdirect radial flow between the inlet and the impeller wheel POCliQtS.

2. In a centrifugal pump the combination with a casing. of a pair ofremova le rings mounted in said casing and formed to provide an annularin'ipeller channel, an impeller wheel operating in said casing. impellerblades on the periphery of said wheel operating in said channel andhaving their faces inclined away from the direction of rotation of saidimpeller, said channel having an intake port for delivering fluid intothe pockets between said blades in a direction substantially parallelwith the axis of the impeller wheel, and means blocking direct radialflow between the inlet and the impeller wheel pockets.

3. In a centrifugal pump the combination with a casing, ol' a pair ofremovable. rings mounted in said casing and formed to provide an annularimpeller channel therein, an impeller wheel operating in said casing.impeller blades on the periphery of said wheel projecting into saidchannel, said channel having an intake port for delivering tiuid intothe pockets between said blades in a direction substantially parallelwith the axis of the impeller wheel, and means blocking direct radialfiow between the inlet and the impeller wheel pockets.

4. In a centrifugal pump the combination with a casing, of a pair ofremovable rings mounted insaid casing and formed to provide an annularimpeller channel therein, an impeller wheel, blades mounted at theperiphery of said wheel and projecting into said channel and havingtheir faces inclined away from the direction of rotation of the wheel.said channel having peripheral intake ports arranged to deliver fluid tothe pockets between said blades from opposite sides of the impeller andin a direction substantially parallel with the axis of the impellerwheel, and means blocking direct radial flow between the inlet and theimpeller wheel pockets.

5. In a centrifugal pump the combination with a casing having an intakeport and an outlet port, of a pair of mating rings fitting within saidcasing and having their adjacent faces formed to provide an annularimpeller channel, said rings being provided with in take and dischargeports coinciding with the inlet and discharge openings of the casing, animpeller wheel within said casing and impeller blades mounted. on theperiphery of said wheel projecting into the annulanchannel formed bysaid rings, and means blocking direct radial flow from the inlet tocircumferential portions of the spaces between the impeller blades.

6. In a centrifugal pump the combination with a casing having inlet anddischarge ports therein, of a pairot' mating rings titling within saidcasing and having their adjacent ,t'aces provided with annular channelsto form, when rings are asstmhled, an impeller channel, the periphery ofsaid rings being pro vided with inlet openings arranged to discharge thefluid into the impeller channel and a rranged to coincide with the inletopening of the casing and with peripheral outlet openings coincidingwith the outlet opening of the casing. an impeller wheel in said casingand impeller blades mounted'on the pcriphery of said wheel andprojecting into said impeller channel, and means blocking db rectradialflow from the inlet to circumt'erential portions of the spaces betweenthe impeller blades, said means cooperating with said inlet openings tocause fluid to flow into

